FWB to more???

Nikeesha
Any tips on how to make my friend with benefit want me to be his girl? We act like a couple when we are alone. He gives me a 100 little pecks and lead to making out. He kisses up my back after we have sex. He lays on top of me so I can't leave. Tickles me then plants a kiss. He is so caring a sweet and yet we are "just friends". And I kept my feeling hidden deep inside so I don't ruin anything. Because he has become the only person and truly makes me happy. Any advise would be welcomed.